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[libunwind] Add initial ARM64EC support #138583

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Merged
merged 2 commits into from
May 13, 2025
Merged

[libunwind] Add initial ARM64EC support #138583

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c6c8a12
[libunwind] Add initial ARM64EC support
cjacek May 2, 2025
44ae97a
Move alias definition
cjacek May 7, 2025
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2 changes: 1 addition & 1 deletion libunwind/src/UnwindRegistersRestore.S
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,7 @@ DEFINE_LIBUNWIND_FUNCTION(__libunwind_Registers_x86_jumpto)
# skip fs
# skip gs

#elif defined(__x86_64__)
#elif defined(__x86_64__) && !defined(__arm64ec__)

DEFINE_LIBUNWIND_FUNCTION(__libunwind_Registers_x86_64_jumpto)
#
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49 changes: 49 additions & 0 deletions libunwind/src/UnwindRegistersSave.S
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Expand Up @@ -65,6 +65,47 @@ DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)
xorl %eax, %eax # return UNW_ESUCCESS
ret

#elif defined(__arm64ec__)

//
// extern int __unw_getcontext(unw_context_t* thread_state)
//
// On entry:
// thread_state pointer is in x0
//
.section .text,"xr",discard,"#__unw_getcontext"
.p2align 2
DEFINE_LIBUNWIND_FUNCTION("#__unw_getcontext")
stp x8, x27, [x0, #0x000] // rax, rbx
stp x0, x1, [x0, #0x010] // rcx, rdx
stp x26,x25, [x0, #0x020] // rdi, rsi
mov x1, sp
stp fp, x1, [x0, #0x030] // rbp, rsp
stp x2, x3, [x0, #0x040] // r8, r9
stp x4, x5, [x0, #0x050] // r10, r11
stp x19,x20, [x0, #0x060] // r12, r13
stp x21,x22, [x0, #0x070] // r14, r15
str x30, [x0, #0x080] // store return address as pc
stp q0, q1, [x0, #0x0b0] // xmm0, xmm1
stp q2, q3, [x0, #0x0d0] // xmm2, xmm3
stp q4, q5, [x0, #0x0f0] // xmm4, xmm5
stp q6, q7, [x0, #0x110] // xmm6, xmm7
stp q8, q9, [x0, #0x130] // xmm8, xmm9
stp q10,q11, [x0, #0x150] // xmm10,xmm11
stp q12,q13, [x0, #0x170] // xmm12,xmm13
stp q14,q15, [x0, #0x190] // xmm14,xmm15
mov x0, #0 // return UNW_ESUCCESS
ret

.weak_anti_dep __unw_getcontext
.set __unw_getcontext, "#__unw_getcontext"

.section .hybmp$x,"yi"
.symidx "#__unw_getcontext"
.symidx $ientry_thunk$cdecl$i8$i8
.word 1
.text

#elif defined(__x86_64__)

#
Expand Down Expand Up @@ -1181,7 +1222,15 @@ DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext)

#endif

#ifdef __arm64ec__
.globl "#unw_getcontext"
.set "#unw_getcontext", "#__unw_getcontext"
.weak_anti_dep unw_getcontext
.set unw_getcontext, "#unw_getcontext"
EXPORT_SYMBOL(unw_getcontext)
#else
WEAK_ALIAS(__unw_getcontext, unw_getcontext)
#endif

#endif /* !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__wasm__) */

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